\begin{originality}
I certify that this thesis which I now submit for examination for the award of 
PhD, is entirely my own work and has not been taken from the work of others, 
save and to the extent that such work has been cited and acknowledged within 
the text of my work. 

This thesis was prepared according to the regulations for postgraduate study by 
research of the Dublin Institute of Technology and has not been submitted in 
whole or in part for another award in any Institute. 

The work reported on in this thesis conforms to the principles and requirements 
of the Institute's guidelines for ethics in research. 

The Institute has permission to keep, lend or copy this thesis in whole or in part, 
on condition that any such use of the material of the thesis be duly 
acknowledged.

  \vspace{0.5cm}
\textbf{Signature:}

  \vspace{0.5cm}
\textbf{Date:}

\end{originality}
